Stone Wall & Dark #1492
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

 More Textures
Background pattern 251 (colour 4) #2164
 Blue  CC 0

To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Iron Grip #587
 Dark  CC BY-SA 3.0

Sounds like something from World of Warcraft. Has to be good.

Source Tony Kinard

Inflicted #117
 Grid  CC BY-SA 3.0

Dark squares with some virus-looking dots in the grid.

Source Hugo Loning

Subtle [email protected] #926
 Light  CC BY-SA 3.0

Super subtle indeed, a medium gray pattern with tiny dots in a grid.

Source Designova

Floral pattern 8 (colour 2) #2095
 Colorful  CC 0

Same flowers, dark background

Source Firkin

Pink Background Pattern #1232
 Pink  CC BY-SA 3.0

A free pink background pattern.

Source V. Hartikainen

Light Wool #695
 Grid  CC BY-SA 3.0

Submitted as a black pattern, I made it light and a few steps more subtle.

Source Andy

Rice Wall #1255
 Wall  CC 0

Zerro CC tillable texture of stones photographed and made by me. CC0

Source Sojan Janso

Always Grey #53
 Dark  CC BY-SA 3.0

Crossing lines with a subtle emboss effect on a dark background.

Source Stefan Aleksić

Concretia 2 #1409
 Dark  CC 0

Gamedev - Concrete Textures. CC0 License.

Source Davit Masia

Concretia 1 #1408
 Gray  CC 0

Gamedev - Concrete Textures. CC0 License.

Source Davit Masia

Seamless Core Pattern #165
 Dark  CC 0

Seamless Core Pattern

Source GDJ

Vintage pattern #1959
 Grid  CC 0

Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.

Source Firkin

Light [email protected] #760
 Paper  CC BY-SA 3.0

Has nothing to do with toast, but it’s nice and subtle.

Source Pippin Lee

Repeating Web Background (Dark Brown) #1079
 Metal  CC BY-SA 3.0

This one has rusty dark brown texture.

Source V. Hartikainen

Black Wall #1240
 Wall  CC 0

Zerro CC tillable texture of stones photographed and made by me. CC0

Source Sojan Janso

Green & Ivy #1365
 Green  CC 0

Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!

Source Linolafett

Decorative divider 220 #2230
 Dark  CC 0

Prepared mostly as a raster in Paint.net and vectorised.

Source Firkin

Prismatic Groovy Concentric Background [email protected] #454
 Noise  CC 0

Prismatic Groovy Concentric Background 2

Source GDJ

Tessellation 16 (colour 3) #2213
 Green  CC 0

The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.

Source Firkin

Diagonal Striped [email protected] #680
 Stripes  CC BY-SA 3.0

Might not be super subtle, but quite original in its form.

Source Alex Smith

Shapes pattern 2 (colour 2) #2240
 Green  CC 0

A background made up of shapes.

Source Firkin

Tessellation 15 (colour 2) #2221
 Yellow  CC 0

The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.

Source Firkin

Background pattern 229 #2305
 Colorful  CC 0

To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

Starring #585
 Dark  CC BY-SA 3.0

If you need stars, this is the one to get.

Source Agus Riyadi

Floral background 20 #1813
 Red  CC 0

Derived from a drawing in 'Elfrica. An historical romance of the twelfth century', Charlotte Boger, 1885

Source Firkin

Background pattern Pink #1938
 Pink  CC 0

Fix and cc0 to get the tile this is based on.

Source SliverKnight